/*
 * Copyright 2011 Lauri Nevala.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package iscte.ai.kcgtd;

import java.util.ArrayList;
import java.util.Calendar;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class CalendarAdapter extends BaseAdapter {
	static final int FIRST_DAY_OF_WEEK = 0; // Sunday = 0, Monday = 1

	private Context mContext;

	private java.util.Calendar month;
	private Calendar selectedDate;
	private ArrayList<String> items;

	public CalendarAdapter(Context c, Calendar monthCalendar) {
		month = monthCalendar;
		selectedDate = (Calendar) monthCalendar.clone();
		mContext = c;
		month.set(Calendar.DAY_OF_MONTH, 1);
		this.items = new ArrayList<String>();
		refreshDays();
	}

	public void setItems(ArrayList<String> items) {
		for (int i = 0; i != items.size(); i++) {
			if (items.get(i).length() == 1) {
				items.set(i, "0" + items.get(i));
			}
		}
		this.items = items;
	}

	public int getCount() {
		return days.length;
	}

	public Object getItem(int position) {
		return null;
	}

	public long getItemId(int position) {
		return 0;
	}

	// create a new view for each item referenced by the Adapter
	public View getView(int position, View convertView, ViewGroup parent) {
		View v = convertView;
		TextView dayView;
		if (convertView == null) { // if it's not recycled, initialize some attributes
			LayoutInflater vi = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
			v = vi.inflate(R.layout.calendar_item, null);
		}
		
		dayView = (TextView) v.findViewById(R.id.calendar_item_date);

		// disable empty days from the beginning
		if (days[position].equals("")) {
			dayView.setClickable(false);
			dayView.setFocusable(false);
		} else {
			// mark current day as focused
			if (month.get(Calendar.YEAR) == selectedDate.get(Calendar.YEAR) && month.get(Calendar.MONTH) == selectedDate.get(Calendar.MONTH)
					&& days[position].equals(""+ selectedDate.get(Calendar.DAY_OF_MONTH))) {
				v.setBackgroundResource(R.drawable.item_background_focused);
			} else {
				v.setBackgroundResource(R.drawable.list_item_background);
			}
		}
		dayView.setText(days[position]);

		// create date string for comparison
		String date = days[position];

		if (date.length() == 1) {
			date = "0" + date;
		}
		
		String monthStr = "" + (month.get(Calendar.MONTH) + 1);
		if (monthStr.length() == 1) {
			monthStr = "0" + monthStr;
		}

		// show icon if date is not empty and it exists in the items array
		ImageView iw = (ImageView) v.findViewById(R.id.calendar_item_date_icon);
		if (date.length() > 0 && items != null && items.contains(date)) {
			iw.setVisibility(View.VISIBLE);
		} else {
			iw.setVisibility(View.INVISIBLE);
		}
		return v;
	}

	public void refreshDays() {
		// clear items
		items.clear();

		int lastDay = month.getActualMaximum(Calendar.DAY_OF_MONTH);
		int firstDay = (int) month.get(Calendar.DAY_OF_WEEK);

		// figure size of the array
		if (firstDay == 1) {
			days = new String[lastDay + (FIRST_DAY_OF_WEEK * 6)];
		} else {
			days = new String[lastDay + firstDay - (FIRST_DAY_OF_WEEK + 1)];
		}

		int j = FIRST_DAY_OF_WEEK;

		// populate empty days before first real day
		if (firstDay > 1) {
			for (j = 0; j < firstDay - FIRST_DAY_OF_WEEK; j++) {
				days[j] = "";
			}
		} else {
			for (j = 0; j < FIRST_DAY_OF_WEEK * 6; j++) {
				days[j] = "";
			}
			j = FIRST_DAY_OF_WEEK * 6 + 1; // sunday => 1, monday => 7
		}

		// populate days
		int dayNumber = 1;
		for (int i = j - 1; i < days.length; i++) {
			days[i] = "" + dayNumber;
			dayNumber++;
		}
	}

	// references to our items
	public String[] days;
}